Page 206
CAT: 8612 November 2019
OPERATING INSTRUCTIONS
1
2
3
4
5
6
To move a vehicle immobilised by the spring brakes due to loss of air
pressure in the brake system, perform the following procedure:
1. Remove the dust
plug from the spring
chamber.
2. Remove the release bolt assembly
from the side pocket. Remove
the release nut and washer from
the release bolt. Slide out the
release bolt.
3. Insert the release bolt through the
opening in the spring chamber
where the plug was removed,
inserting it into the pressure plate.
4. Turn the release bolt
1
/
4
turn
clockwise in the pressure plate.
This secures the cross pin into
the cross pin area of the pressure
plate and locks it into the manual
release position.
5. Assemble the release bolt washer
and nut on the release stud.
6. With a spanner, turn the release bolt
assembly nut until the compression
spring is 90-95 percent caged.
While doing this, check to make
sure the push rod (adapter push rod
or service push rod) is retracting.
Do not over-torque the release bolt
assembly. (S-Cam type maximum
68Nm.) The spring brake is
mechanically released.
Repeat steps 1-6 for all spring
brakes on the vehicle
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